Finding the Fourth Proportional to 2,186.82, 3,279.01 and 870.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.82 : 3,279.01 = 870.47 : x
2. Step 2: Convert to fraction form
   2,186.82/3,279.01 = 870.47/x
3. Step 3: Cross multiply
   2,186.82x = 3,279.01 × 870.47
4. Step 4: Simplify right side
   2,186.82x = 2,854,262.90
5. Step 5: Solve for x
   x = 2,854,262.90/2,186.82
6. Step 6: Final answer
   x = 1,305.21